#ifndef BMP2JPG_A_jpg_h
#define BMP2JPG_A_jpg_h

#define BYTE unsigned char
#define SBYTE signed char
#define SWORD signed short int
#define WORD unsigned short int
#define DWORD unsigned long int
#define SDWORD signed long int

static struct APP0infotype {
    WORD marker;// = 0xFFE0
    WORD length; // = 16 for usual JPEG, no thumbnail
    BYTE JFIFsignature[5]; // = "JFIF",'\0'
    BYTE versionhi; // 1
    BYTE versionlo; // 1
    BYTE xyunits;   // 0 = no units, normal density
    WORD xdensity;  // 1
    WORD ydensity;  // 1
    BYTE thumbnwidth; // 0
    BYTE thumbnheight; // 0
} APP0info={0xFFE0,16,'J','F','I','F',0,1,1,0,1,1,0,0};

static struct  SOF0infotype {
    WORD marker; // = 0xFFC0
    WORD length; // = 17 for a truecolor YCbCr JPG
    BYTE precision ;// Should be 8: 8 bits/sample
    WORD height ;
    WORD width;
    BYTE nrofcomponents;//Should be 3: We encode a truecolor JPG
    BYTE IdY;  // = 1
    BYTE HVY; // sampling factors for Y (bit 0-3 vert., 4-7 hor.)
    BYTE QTY;  // Quantization Table number for Y = 0
    BYTE IdCb; // = 2
    BYTE HVCb;
    BYTE QTCb; // 1
    BYTE IdCr; // = 3
    BYTE HVCr;
    BYTE QTCr; // Normally equal to QTCb = 1
} SOF0info = { 0xFFC0,17,8,0,0,3,1,0x11,0,2,0x11,1,3,0x11,1};
// Default sampling factors are 1,1 for every image component: No downsampling

static struct DQTinfotype {
    WORD marker;  // = 0xFFDB
    WORD length;  // = 132
    BYTE QTYinfo;// = 0:  bit 0..3: number of QT = 0 (table for Y)
    //       bit 4..7: precision of QT, 0 = 8 bit
    BYTE Ytable[64];
    BYTE QTCbinfo; // = 1 (quantization table for Cb,Cr}
    BYTE Cbtable[64];
} DQTinfo;
// Ytable from DQTinfo should be equal to a scaled and zizag reordered version
// of the table which can be found in "tables.h": std_luminance_qt
// Cbtable , similar = std_chrominance_qt
// We'll init them in the program using set_DQTinfo function

static struct DHTinfotype {
    WORD marker;  // = 0xFFC4
    WORD length;  //0x01A2
    BYTE HTYDCinfo; // bit 0..3: number of HT (0..3), for Y =0
    //bit 4  :type of HT, 0 = DC table,1 = AC table
    //bit 5..7: not used, must be 0
    BYTE YDC_nrcodes[16]; //at index i = nr of codes with length i
    BYTE YDC_values[12];
    BYTE HTYACinfo; // = 0x10
    BYTE YAC_nrcodes[16];
    BYTE YAC_values[162];//we'll use the standard Huffman tables
    BYTE HTCbDCinfo; // = 1
    BYTE CbDC_nrcodes[16];
    BYTE CbDC_values[12];
    BYTE HTCbACinfo; //  = 0x11
    BYTE CbAC_nrcodes[16];
    BYTE CbAC_values[162];
} DHTinfo;

static struct SOSinfotype {
    WORD marker;  // = 0xFFDA
    WORD length; // = 12
    BYTE nrofcomponents; // Should be 3: truecolor JPG
    BYTE IdY; //1
    BYTE HTY; //0 // bits 0..3: AC table (0..3)
    // bits 4..7: DC table (0..3)
    BYTE IdCb; //2
    BYTE HTCb; //0x11
    BYTE IdCr; //3
    BYTE HTCr; //0x11
    BYTE Ss,Se,Bf; // not interesting, they should be 0,63,0
} SOSinfo={0xFFDA,12,3,1,0,2,0x11,3,0x11,0,0x3F,0};

typedef struct { BYTE B,G,R; } colorRGB;
typedef struct { BYTE length;
    WORD value;} bitstring;

#define  Y(R,G,B) ((BYTE)( (YRtab[(R)]+YGtab[(G)]+YBtab[(B)])>>16 ) - 128)
#define Cb(R,G,B) ((BYTE)( (CbRtab[(R)]+CbGtab[(G)]+CbBtab[(B)])>>16 ) )
#define Cr(R,G,B) ((BYTE)( (CrRtab[(R)]+CrGtab[(G)]+CrBtab[(B)])>>16 ) )

#define writebyte(b) fputc((b),fp_jpeg_stream)
#define writeword(w) writebyte((w)/256);writebyte((w)%256);



static BYTE zigzag[64]={ 0, 1, 5, 6,14,15,27,28,
    2, 4, 7,13,16,26,29,42,
    3, 8,12,17,25,30,41,43,
    9,11,18,24,31,40,44,53,
    10,19,23,32,39,45,52,54,
    20,22,33,38,46,51,55,60,
    21,34,37,47,50,56,59,61,
    35,36,48,49,57,58,62,63 };

/* These are the sample quantization tables given in JPEG spec section K.1.
 The spec says that the values given produce "good" quality, and
 when divided by 2, "very good" quality.*/
static BYTE std_luminance_qt[64] = {
    16,  11,  10,  16,  24,  40,  51,  61,
    12,  12,  14,  19,  26,  58,  60,  55,
    14,  13,  16,  24,  40,  57,  69,  56,
    14,  17,  22,  29,  51,  87,  80,  62,
    18,  22,  37,  56,  68, 109, 103,  77,
    24,  35,  55,  64,  81, 104, 113,  92,
    49,  64,  78,  87, 103, 121, 120, 101,
    72,  92,  95,  98, 112, 100, 103,  99
};
static BYTE std_chrominance_qt[64] = {
    17,  18,  24,  47,  99,  99,  99,  99,
    18,  21,  26,  66,  99,  99,  99,  99,
    24,  26,  56,  99,  99,  99,  99,  99,
    47,  66,  99,  99,  99,  99,  99,  99,
    99,  99,  99,  99,  99,  99,  99,  99,
    99,  99,  99,  99,  99,  99,  99,  99,
    99,  99,  99,  99,  99,  99,  99,  99,
    99,  99,  99,  99,  99,  99,  99,  99
};
// Standard Huffman tables (cf. JPEG standard section K.3) */

static BYTE std_dc_luminance_nrcodes[17]={0,0,1,5,1,1,1,1,1,1,0,0,0,0,0,0,0};
static BYTE std_dc_luminance_values[12]={0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11};

static BYTE std_dc_chrominance_nrcodes[17]={0,0,3,1,1,1,1,1,1,1,1,1,0,0,0,0,0};
static BYTE std_dc_chrominance_values[12]={0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11};

static BYTE std_ac_luminance_nrcodes[17]={0,0,2,1,3,3,2,4,3,5,5,4,4,0,0,1,0x7d };
static BYTE std_ac_luminance_values[162]= {
    0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
    0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
    0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
    0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
    0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
    0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
    0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
    0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
    0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
    0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
    0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
    0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
    0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
    0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
    0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
    0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
    0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
    0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
    0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
    0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
    0xf9, 0xfa };

static BYTE std_ac_chrominance_nrcodes[17]={0,0,2,1,2,4,4,3,4,7,5,4,4,0,1,2,0x77};
static BYTE std_ac_chrominance_values[162]={
    0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
    0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
    0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
    0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
    0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
    0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
    0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
    0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
    0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
    0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
    0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
    0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
    0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
    0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
    0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
    0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
    0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
    0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
    0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
    0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
    0xf9, 0xfa };





static BYTE bytenew=0; // The byte that will be written in the JPG file
static SBYTE bytepos=7; //bit position in the byte we write (bytenew)
//should be<=7 and >=0
static WORD mask[16]={1,2,4,8,16,32,64,128,256,512,1024,2048,4096,8192,16384,32768};

// The Huffman tables we'll use:
static bitstring YDC_HT[12];
static bitstring CbDC_HT[12];
static bitstring YAC_HT[256];
static bitstring CbAC_HT[256];

static BYTE *category_alloc;
static BYTE *category; //Here we'll keep the category of the numbers in range: -32767..32767
static bitstring *bitcode_alloc;
static bitstring *bitcode; // their bitcoded representation

//Precalculated tables for a faster YCbCr->RGB transformation
// We use a SDWORD table because we'll scale values by 2^16 and work with integers
static SDWORD YRtab[256],YGtab[256],YBtab[256];
static SDWORD CbRtab[256],CbGtab[256],CbBtab[256];
static SDWORD CrRtab[256],CrGtab[256],CrBtab[256];
static float fdtbl_Y[64];
static float fdtbl_Cb[64]; //the same with the fdtbl_Cr[64]

colorRGB *RGB_buffer; //image to be encoded
WORD Ximage,Yimage;// image dimensions divisible by 8
static SBYTE YDU[64]; // This is the Data Unit of Y after YCbCr->RGB transformation
static SBYTE CbDU[64];
static SBYTE CrDU[64];
static SWORD DU_DCT[64]; // Current DU (after DCT and quantization) which we'll zigzag
static SWORD DU[64]; //zigzag reordered DU which will be Huffman coded

FILE *fp_jpeg_stream;

#endif
